1. Home
  2. Directory
  3. California
  4. Pittsburg
  5. Family Medicine
  6. NPI Profile

SIAMAK ELYASI M.D.
NPI 1467407809
Family Medicine in Pittsburg, CA

Active since May 24, 2006PECOS Enrolled
2220 GLADSTONE DR, SUITE 3, PITTSBURG, CA 94565(925) 779-9601(925) 432-4590 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 13, 2026, Aug 26, 2019 (2 updates tracked since 2019).

About Siamak Elyasi M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SIAMAK ELYASI M.D. (NPI 1467407809) is an individual family medicine provider in Pittsburg, California, licensed in California (A50205) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1467407809
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameSIAMAK ELYASICredential: M.D.
Location Address2220 GLADSTONE DR, SUITE 3Pittsburg, CA 94565-5123
Mailing Address2220 Gladstone Dr, Ste 3Pittsburg, CA 94565-5123 · (925) 779-9601 · Fax (925) 432-4590
Phone(925) 779-9601
Fax(925) 432-4590
Sole ProprietorNo
Enumeration DateMay 24, 2006
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1467407809 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · A50205
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
2220 GLADSTONE DR, Pittsburg, CA 94565
Open in Google Maps ↗

Other Identifiers 1

Medicaid00A502050CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Siamak Elyasi M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Siamak Elyasi reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Pittsburg-Antioch Medical Group A Professional Corporation
Same address
Internal Medicine
2220 GLADSTONE DR, SUITE 3
Pittsburg, CA 94565
  • Reassigned Medicare billing, California enrollment
  • 18 clinicians in this Medicare group
NPI 1619922911 (924) 432-3318

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94565 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 3

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
5 suppliers12 claims20 services$5.28 avg. paid by Medicare
Enteral feeding supply kit; pump fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4035
Other-Enteral and Parenteral · category OB006N
1 supplier11 claims341 services$4.16 avg. paid by Medicare
Enteral formula, nutritionally complete, for special metabolic needs, excludes inherited disease of metabolism, includes altered composition of proteins, fats, carbohydrates, vitamins and/or minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4154
Other-Enteral and Parenteral · category OB006N
1 supplier11 claims5,340 services$0.54 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PRAGNESH M. PATEL MD
Internal Medicine (Endocrinology, Diabetes & Metabolism)
2220 GLADSTONE DR, SUITE 3
PITTSBURG, CA 94565
Contra Costa County (925) 432-3318
WENGANG ZHANG M.D.
Internal Medicine
2220 GLADSTONE DR, SUITE 3
PITTSBURG, CA 94565
Contra Costa County (925) 432-3318
CHRISTINE CAVE NP
Nurse Practitioner (Adult Health)
2220 GLADSTONE DR
PITTSBURG, CA 94565
Contra Costa County (925) 432-3318
HENRY P GONG M.D.
Internal Medicine (Interventional Cardiology)
2220 GLADSTONE DR, SUITE 3
PITTSBURG, CA 94565
Contra Costa County (925) 432-3318
DR. ALEJANDRO R PRIETO MD
Internal Medicine (Interventional Cardiology)
2220 GLADSTONE DR, SUITE 3
PITTSBURG, CA 94565
Contra Costa County (925) 432-3318
ANGELITA DINEROS TANGCO MD
Psychiatry & Neurology (Neurology)
2220 GLADSTONE DR, SUITE 3 SPRINGHILL MEDICAL GROUP
PITTSBURG, CA 94565
Contra Costa County (925) 432-3118
HSIEN-WEN HSU M.D.
Internal Medicine (Pulmonary Disease)
2220 GLADSTONE DR, SUITE 3
PITTSBURG, CA 94565
Contra Costa County (925) 432-3318
JOHN W. GALLO DO
Internal Medicine
2220 GLADSTONE DR, STE 3
PITTSBURG, CA 94565
Contra Costa County (925) 432-3318

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Siamak Elyasi's NPI number?

The NPI number for Siamak Elyasi is 1467407809. It was assigned to this individual provider in the NPPES registry on May 24, 2006.

Where is Siamak Elyasi located?

Siamak Elyasi practices at 2220 Gladstone Dr Suite 3, Pittsburg, CA 94565. The listed phone number is (925) 779-9601.

What is Siamak Elyasi's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Siamak Elyasi enrolled in Medicare?

Yes. Siamak Elyasi is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Siamak Elyasi's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Siamak Elyasi reassigns Medicare benefits to Pittsburg-Antioch Medical Group A Professional Corporation (Pittsburg, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Siamak Elyasi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Siamak Elyasi was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.